Perhaps you should try some spelling variations:
"aaas symposium series" » "aaas symposium sas", "aaas symposium sss", "aaas symposium spire", "das symposium series", "cas symposium series", "gras symposium series"
"abacus symposium semi" » "spaces symposium semi", "lakes symposium semi", "bibos symposium semi", "abacus symposium sas", "abacus symposium sss", "abacus symposium sagt"
"acs symposium semi" » "acs symposium sas", "acs symposium sss", "acs symposium sagt", "das symposium semi", "lakes symposium semi", "games symposium semi"
"bacus symposium semi" » "bacus symposium sas", "bacus symposium sss", "bacus symposium sagt"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("aaas symposium series") OR ((("abacus symposium semi") OR ((("acs symposium semi") OR ("bacus symposium semi")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"aaas symposium series\") or (((\"abacus symposium semi\") or (((\"acs symposium semi\") OR (\"bacus symposium semi\"))))))".
• Removing quotes may allow a broader search: (( aaas symposium series ) or ((( abacus symposium semi ) or ((( acs symposium semi ) OR ( bacus symposium semi )))))).
• Adding a wildcard symbol may retrieve word variants: (("aaas symposium series") or ((("abacus symposium semi") or ((("acs symposium semi") OR ("bacus symposium semi"))))))*.